<!DOCTYPE HTML>
<html>
<head>
    <meta charset="UTF-8">
    <title>简易聊天</title>
</head>

<body>
<h1 align="center">卓越工程师班及时聊天系统</h1>
<br/>
<div  id="mylogin" >
    请输入你的设备编号<input id="myname" type="text"/>
    请输入你的区域编码<input id="origin" type="text"/>
    <button onclick="login()">登录</button>

</div>
<div  id="mysend" style="display: none">
    <input id="text" type="text"/>
    <button onclick="send()">Send</button>
    <button onclick="closeWebSocket()">Close</button>
    <div id="message">
    </div>
</div>


</body>

<script type="text/javascript">
    var myname;
    var websocket = null;



    //将消息显示在网页上
    function setMessageInnerHTML(innerHTML) {
        document.getElementById('message').innerHTML += innerHTML + '<br/>';
    }

    //关闭连接
    function closeWebSocket() {
        websocket.close();
    }

    //发送消息
    function send() {
        var message = document.getElementById('text').value;
        websocket.send(message);
    }

    function login(){
        var name = document.getElementById('myname').value;
        var origin = document.getElementById('origin').value;
        myname = name;
        document.getElementById('mylogin').style.display = "none";
        document.getElementById('mysend').style.display = "";

        //判断当前浏览器是否支持WebSocket
        if ('WebSocket' in window) {
            websocket = new WebSocket("ws://localhost:8099/socket/connection?terminnalno="+name+"&orginalno="+origin);
        }
        else {
            alert('Not support websocket')
        }

        //连接发生错误的回调方法
        websocket.onerror = function () {
            setMessageInnerHTML("error");
        };

        //连接成功建立的回调方法
        websocket.onopen = function (event) {
            setMessageInnerHTML("open");
        }

        //接收到消息的回调方法
        websocket.onmessage = function (event) {
            setMessageInnerHTML(event.data);
        }

        //连接关闭的回调方法
        websocket.onclose = function () {
            setMessageInnerHTML("close");
        }

        //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
        window.onbeforeunload = function () {
            websocket.close();
        }
    }
</script>
</html>